WO2009066198A1 - Procédé et dispositif de commande d'unité d'éclairage - Google Patents

Procédé et dispositif de commande d'unité d'éclairage Download PDF

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Publication number
WO2009066198A1
WO2009066198A1 PCT/IB2008/054638 IB2008054638W WO2009066198A1 WO 2009066198 A1 WO2009066198 A1 WO 2009066198A1 IB 2008054638 W IB2008054638 W IB 2008054638W WO 2009066198 A1 WO2009066198 A1 WO 2009066198A1
Authority
WO
WIPO (PCT)
Prior art keywords
input signal
color gamut
value
controller
lighting unit
Prior art date
Application number
PCT/IB2008/054638
Other languages
English (en)
Inventor
Josephus A. M. Van Erp
Erik Nieuwlands
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2009066198A1 publication Critical patent/WO2009066198A1/fr

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source

Definitions

  • the present disclosure relates to a controller for a lighting unit, which unit comprises at least a first and a second primary light source having mutually different spectra and being adapted to be individually controlled in response to an input signal, such that the color of the mixed output light is variable, the primary light sources spanning a maximum color gamut in a color space.
  • the disclosure further relates to a corresponding method for controlling a lighting unit.
  • lighting unit has a red, a green, and a blue light emitting diode, LED.
  • LED light emitting diode
  • primary light sources can have slightly differing properties which means that lighting units may span slightly different gamuts in a color space. A color that can be produced by one lighting unit may therefore not be achievable for another unit.
  • the properties of the primary light sources may further vary with varying temperature or due to ageing.
  • One object of the present disclosure is to provide a simple and reliable arrangement that improves color uniformity when a surface is illuminated be a plurality of lighting units of the above-indicated type.
  • This object may be achieved by means of a controller of the above-indicated kind, wherein a fixed color gamut is defined for the controller, the fixed color gamut being smaller than the maximum color gamut, the controller comprises a comparator which is adapted to determine whether an input signal refers to a value within the fixed color gamut, and the controller is adapted to initiate an action if the input signal refers to a value outside the fixed color gamut.
  • the lighting units can be controlled to produce colors that can be achieved by all or most lighting units which improves color uniformity.
  • the above-mentioned action may comprise modifying the input signal to a value within the fixed color gamut, e.g. by changing the input signal to the value on the color gamut boundary that is closest to input signal value.
  • the action may comprise cancelling the input signal, such that no light is output from the lighting unit.
  • the action may comprise generating a warning indication.
  • the lighting unit may then try to produce the inputted color signal.
  • the color signal may at the same time be adjusted at a higher level in the system.
  • At least one maximum flux may defined, and the comparator may compare the flux value of the input signal with the maximum flux, and reduce the flux value to the maximum flux should it exceed the maximum flux. This allows also improved brightness uniformity over an illuminated surface.
  • the primary light sources may be in the form of light emitting diodes, LEDs or incandescent lamps.
  • the controller may be adapted to control a plurality of lighting units.
  • the object is further achieved by means of a corresponding method for controlling a lighting unit, wherein a fixed color gamut is defined for a controller, the fixed color gamut being smaller than the maximum color gamut, it is determined whether an input signal refers to a value within the fixed color gamut, and an action is initiated if the input signal refers to a value outside the fixed color gamut.
  • Fig 1 illustrates schematically a lighting system which is used to illuminate a surface.
  • Fig 2 illustrates a color space wherein the color gamuts of three different lighting units are indicated.
  • Fig 3 shows a lighting unit with tree primary light sources, where a fixed color gamut is used.
  • Fig 1 illustrates schematically a lighting system 1 which is used to illuminate a surface 3.
  • the lighting system 1 comprises an overall controller 5, which provides input signals to a number of lighting units 1, 9, 11, which each comprises a number of primary light sources with different colors.
  • each lighting unit e.g. 7, may have a red, a green, and a blue (RGB) primary light source, even though other combinations are possible as will be described further later.
  • RGB red, a green, and a blue
  • each unit comprises at least two primary light sources having different spectra.
  • the primary light sources may be controlled individually, such that the color of the light produced by each lighting unit, being the sum of the light from the primary light sources, is variable.
  • each lighting unit 7, 9, 11 illuminates one portion each of the surface and with a reasonably uniformly colored light.
  • relatively small deviations in color between two units may be detected by the human eye, especially at boundaries 13 between two adjacent lighting units. This may disturb the impression that the surface 3 is illuminated by a single light source. The effect is particularly salient when the lighting units are used close to their gamut boundaries, as will be described later.
  • Fig 2 illustrates a color space wherein the color gamuts of three different lighting units are indicated in a CIE 1931 color space 15.
  • Each lighting unit has a red, a green, and a blue primary light source (RGB).
  • the primary light sources of a first a second and a third lighting unit are indicated by the characters, "+”, "x” and "o", respectively.
  • the different green primary light sources produce slightly different wavelengths.
  • the differences are exaggerated in fig 2 to facilitate the understanding of this disclosure. The differences imply that each lighting unit will have a slightly different gamut 17, 19, 21, as shown with the dotted, dashed and dash-dot lines of fig 2.
  • Some input signals may therefore not be accurately produced by some lighting units, as those signals may relate to a color outside the gamut of that lighting unit, while other lighting units can respond accordingly.
  • the color defined by the dot 20 in fig 2 may only be correctly produced by the first lighting unit 17. This means that color differences may occur as described above. Even if the primary light sources were carefully chosen to achieve well matched lighting units, this could not ensure uniformly colored light as the primary light sources change their wavelengths with ageing and varying temperature.
  • the inventors have found that the human eye is much less sensitive to uniform color shifts than color differences between adjacent lighting units. Therefore, the use of a fixed color gamut has been introduced.
  • the fixed gamut defines a color space that can be reproduced by all or most lighting units. By allowing the lighting units to operate based on the fixed color gamut color differences between adjacent lighting units may be avoided to a large extent.
  • fig 2 an example of a fixed color gamut 23 is indicated, which is a color space achievable by all three lighting units.
  • Fig 3 shows a lighting unit having a controller 24 and tree primary light sources 25, 27, 29, and where a fixed color gamut is used.
  • the lighting unit receives an input signal X 1 , y l s which defines a color in a color space, and supplies energy to the primary light sources correspondingly.
  • a fixed color gamut is defined for this lighting unit, and a comparator 31 tests whether the received input signal X 1 , yi lies within the defined fixed gamut. The result of this test is fed to a control block 33, together with the input signal X 1 , yi.
  • the control block 33 may, if the received input signal refers to a value outside the fixed color gamut, carry out different actions as will now be described.
  • control block 33 may modify the input signal X 1 , yi to a modified signal x 2 , y 2 which is defined by the fixed color gamut. Typically, this may be done by changing the input signal to the value on the fixed color gamut boundary that is closest to the original input signal value. Alternatively, another value may be used, e.g. the closest value among a number of standardized set points.
  • a second option is to simply cancel the input signal, such that no light is output from the lighting unit in question.
  • a third option is to use the input signal unmodified and to generate a warning indication, which is fed back to the source of the input signal and informs the operator or device generating the input signal that the received signal does not lie within the fixed color gamut and that undesired effects, as described above, may arise. This warning may then cause the input signal to be changed at a higher level in the system.
  • control block 33 outputs a signal x 2 , y 2 , which may consist of the input signal or a modified version thereof.
  • This signal may be used in a converter block 35 as a basis for achieving control signals R, G, B for the primary light sources 25, 27, 29, as is well known per se.
  • PWM control blocks 37, 39, 41 may be used to deliver an accurate amount of energy to the primary light sources as a pulse ratio based on a DC value.
  • the primary light sources may be light emitting diodes, LEDs, incandescent lamps or the like.
  • RGB light sources are used in the above-described examples, other combinations of primary light sources are possible.
  • a white light source may be added to provide an RGBW unit, or the red light source may be supported by an amber light source to provide an RGBA unit.
  • a maximum flux may be defined for the lighting unit.
  • the comparator may then compare the flux value of the input signal with the maximum flux. If the latter is exceeded, the flux value may be reduced accordingly.
  • the maximum flux may be uniform over the color gamut, or may vary over the same.
  • the control unit and comparator may be provided in an overall control unit, cf. 5 of fig 1, and the above described controller may thus be adapted to control a plurality of lighting units.
  • the disclosure relates to a controller for a lighting unit as well as a method for controlling a lighting unit.
  • the lighting unit has a plurality of differently colored primary light sources which may be controlled independently.
  • an input signal is evaluated with respect to a fixed color gamut by means of a comparator.
  • the fixed gamut is chosen such that all or most lighting units can produce the colors therein. If the input signal relates to a value outside the fixed gamut, the input signal may be modified to a value inside the fixed gamut. Then, color differences between adjacent lighting units may be avoided to a great extent.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention porte sur un contrôleur pour une unité d'éclairage ainsi que sur un procédé de commande d'une unité d'éclairage. L'unité d'éclairage a une pluralité de sources de lumière primaire de différentes couleurs qui peuvent être commandées indépendamment. Pour obtenir une uniformité de couleur entre de multiples unités d'éclairage, un signal d'entrée est évalué par rapport à une gamme de couleurs fixe au moyen d'un comparateur (31). La gamme fixe est choisie de telle manière que la totalité ou la plupart des unités d'éclairage peuvent produire les couleurs dans cette gamme. Si le signal d'entrée désigne une valeur à l'extérieur de la gamme fixe, le signal d'entrée peut être modifié en une valeur à l'intérieur de celle-ci. Des différences de couleur entre unités d'éclairage adjacentes peuvent donc être évitées dans une grande mesure.
PCT/IB2008/054638 2007-11-20 2008-11-06 Procédé et dispositif de commande d'unité d'éclairage WO2009066198A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07121072.8 2007-11-20
EP07121072 2007-11-20

Publications (1)

Publication Number Publication Date
WO2009066198A1 true WO2009066198A1 (fr) 2009-05-28

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Country Status (2)

Country Link
TW (1) TW200942074A (fr)
WO (1) WO2009066198A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2504460A (en) * 2012-06-12 2014-02-05 Michael Colin Edwards Colour mixing luminaire
WO2013179215A3 (fr) * 2012-05-29 2014-03-13 Koninklijke Philips N.V. Système d'éclairage réglable
EP2950618A1 (fr) * 2014-05-26 2015-12-02 Martin Professional ApS Système de commande de couleur avec étalonnage variable
WO2018198062A1 (fr) * 2017-04-28 2018-11-01 Osram Gmbh Procédé de commande de systèmes d'éclairage, système et produit-programme informatique correspondants

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050062446A1 (en) * 2003-07-23 2005-03-24 Tir Systems Ltd. Control system for an illumination device incorporating discrete light sources
US20060098077A1 (en) * 2004-03-15 2006-05-11 Color Kinetics Incorporated Methods and apparatus for providing luminance compensation
US20060152524A1 (en) * 2005-01-12 2006-07-13 Eastman Kodak Company Four color digital cinema system with extended color gamut and copy protection
WO2007033667A1 (fr) * 2005-09-19 2007-03-29 Vip 1 Aps Commande de couleur d'eclairage dynamique
WO2008029324A2 (fr) * 2006-09-06 2008-03-13 Philips Intellectual Property & Standards Gmbh Génération de lumière par mélange de couleurs

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050062446A1 (en) * 2003-07-23 2005-03-24 Tir Systems Ltd. Control system for an illumination device incorporating discrete light sources
US20060098077A1 (en) * 2004-03-15 2006-05-11 Color Kinetics Incorporated Methods and apparatus for providing luminance compensation
US20060152524A1 (en) * 2005-01-12 2006-07-13 Eastman Kodak Company Four color digital cinema system with extended color gamut and copy protection
WO2007033667A1 (fr) * 2005-09-19 2007-03-29 Vip 1 Aps Commande de couleur d'eclairage dynamique
WO2008029324A2 (fr) * 2006-09-06 2008-03-13 Philips Intellectual Property & Standards Gmbh Génération de lumière par mélange de couleurs

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013179215A3 (fr) * 2012-05-29 2014-03-13 Koninklijke Philips N.V. Système d'éclairage réglable
CN104322148A (zh) * 2012-05-29 2015-01-28 皇家飞利浦有限公司 可调照明系统
US20150108921A1 (en) * 2012-05-29 2015-04-23 Koninklijke Philips N.V. Tunable lighting system
US9253855B2 (en) 2012-05-29 2016-02-02 Koninklijke Philips N.V. Tunable lighting system
GB2504460A (en) * 2012-06-12 2014-02-05 Michael Colin Edwards Colour mixing luminaire
EP2950618A1 (fr) * 2014-05-26 2015-12-02 Martin Professional ApS Système de commande de couleur avec étalonnage variable
US9578713B2 (en) 2014-05-26 2017-02-21 Martin Professional Aps Color control system with variable calibration
WO2018198062A1 (fr) * 2017-04-28 2018-11-01 Osram Gmbh Procédé de commande de systèmes d'éclairage, système et produit-programme informatique correspondants

Also Published As

Publication number Publication date
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